SQL Server. System.Data.SqlClient

Transcription

1 W.MeI/Xf 7HeN1f @5f 3LeJ5f V/KeO.Yf W.Yh J(Yg W.Yg 75g @5f W.MeI/Xf W.Yh J(Yg W.Yg 75g 7HeN1f 3LeJ5f V/KeO.Yf @5f W.MI/Xf 75g 7HeN1f J(Yg W.Yh 3)KO.Yf W.YeI')Xf 7HeV'1f 3LfJ5f V/KeO.Yf J5g J5h J5g W-Xe W.MI/Xf 7HeN1f W&(YV46Kh V+Ye W.YeI')Xf 3)KO.Yf (Y (Yf 3LfJ5f V/KeO.Yf SqlConnection SQL Server Windows AddressList 1 System.Data.SqlClient using System.Data.SqlClient; 2 string connstring =@"Data Source=.\sqlexpress;Initial Catalog=AddressList; Integrated Security=True"; SqlConnection connection = new SqlConnection(connString); connection.open(); MessageBox.Show(" connection.close(); MessageBox.Show(" SqlConnection SqlConnection SqlConnection SQL Server SqlConnection SqlConnection ConnectionString Open Close

2 W.MeI/Xf 7HeN1f @5f 3LeJ5f V/KeO.Yf W.Yh J(Yg W.Yg 75g @5f W.MeI/Xf W.Yh J(Yg W.Yg 75g 7HeN1f 3LeJ5f V/KeO.Yf @5f W.MI/Xf 75g 7HeN1f J(Yg W.Yh 3)KO.Yf W.YeI')Xf 7HeV'1f 3LfJ5f V/KeO.Yf J5g J5h J5g W-Xe W&(YV46Kh V+Ye (Y (Yf O&0Yg W&(Yf W&(Yg 2 9 Windows SQL Server SQL Server Windows Data Source=.\sqlexpress;Initial Catalog=AddressList;Integrated Security=True Data Source SQL Server. Microsoft SQL Server Express Edition.\sqlexpress Initial Catalog AddressList Integrated Security True Windows SQL Server Data Source=.\sqlexpress;Initial Catalog=AddressList;uid=sa;pwd=sa uid pwd SQL Server A 2 SqlConnection SqlConnection SqlConnection connection = new SqlConnection(connString); 3 SqlConnection Open() connection.open(); SqlConnection Close() connection.close(); NET try catch finally finally string connstring =@"Data Source=.\sqlexpress;Initial Catalog=AddressList;uid=sa;pwd=sa"; SqlConnection connection = new SqlConnection(connString); try connection.open(); MessageBox.Show(" catch (Exception ex) MessageBox.Show(ex.ToString()); finally connection.close();

3 W.MeI/Xf 7HeN1f @5f 3LeJ5f V/KeO.Yf W.Yh J(Yg W.Yg 75g @5f W.MeI/Xf W.Yh J(Yg W.Yg 75g 7HeN1f 3LeJ5f V/KeO.Yf @5f W.MI/Xf 75g 7HeN1f J(Yg W.Yh 3)KO.Yf W.YeI')Xf 7HeV'1f 3LfJ5f V/KeO.Yf J5g J5h J5g W-Xe W&(YV46Kh V+Ye W.MeI/Xf 7HeN1f (Y (Yf 3LeJ5f V/KeO.Yf 10 MessageBox.Show(" using C# using SqlConnection using string connstring Source=.\sqlexpress;Initial Catalog=AddressList;uid=sa;pwd=sa"; using (SqlConnection connection = new SqlConnection(connString)) connection.open(); MessageBox.Show(" using TextBox Button txtusername txtuserpassword PasswordChar * btnlogin Text btncancel Text private void btnlogin_click(object sender, EventArgs e) if (txtusername.text.trim() == "" txtuserpassword.text.trim() == "") MessageBox.Show(" txtusername.focus(); return; string connstring Source=.\sqlexpress;Initial Catalog=AddressList;Integrated Security=True"; string sqlstr = string.format("select count(*) from [User] where UserName='0' and Password='1'", txtusername.text.trim(), txtuserpassword.text.trim());

4 W.MeI/Xf 7HeN1f @5f 3LeJ5f V/KeO.Yf W.Yh J(Yg W.Yg 75g @5f W.MeI/Xf W.Yh J(Yg W.Yg 75g 7HeN1f 3LeJ5f V/KeO.Yf @5f W.MI/Xf 75g 7HeN1f J(Yg W.Yh 3)KO.Yf W.YeI')Xf 7HeV'1f 3LfJ5f V/KeO.Yf J5g J5h J5g W-Xe W&(YV46Kh V+Ye (Y (Yf using (SqlConnection conn = new SqlConnection(connString)) SqlCommand cmd = new SqlCommand(sqlStr, conn); conn.open(); int n = Convert.ToInt32(cmd.ExecuteScalar()); if (n==1) MessageBox.Show(" else MessageBox.Show(",!", " txtusername.text = ""; txtuserpassword.text = ""; txtusername.focus(); private void btncancel_click(object sender, EventArgs e) this.close(); SQL string.format string sqlstr = string.format("select count(*) from [User] where UserName='0' and Password='1'", txtusername.text.trim(), txtuserpassword.text.trim()); admin admin SQL select count(*) from [User] where UserName='admin' and Password='admin' UserName Password varchar User User SQL Server SQL B,! SqlCommand SqlCommand SqlCommand SQL SqlCommand 1 SqlConnection SqlConnection 2 SQL SQL 3 SqlCommand SqlCommand SqlCommand SQL SqlConnection

5 W.MeI/Xf 7HeN1f @5f 3LeJ5f V/KeO.Yf W.Yh J(Yg W.Yg 75g @5f W.MeI/Xf W.Yh J(Yg W.Yg 75g 7HeN1f 3LeJ5f V/KeO.Yf @5f W.MI/Xf 75g 7HeN1f J(Yg W.Yh 3)KO.Yf W.YeI')Xf 7HeV'1f 3LfJ5f V/KeO.Yf J5g J5h J5g W-Xe W&(YV46Kh V+Ye (Y W.Yh J(Yg W.Yg 75g 12 SqlCommand cmd = new SqlCommand(sqlStr, conn); 4 SqlCommand SQL SqlCommand SqlCommand SqlCommand ExecuteScalar ExecuteNonQuery ExecuteReader object SQL SqlDataReader SqlCommand ExecuteScalar ExecuteScalar object int n = Convert.ToInt32(cmd.ExecuteScalar()); n 1 SqlCommand ExecuteNonQuery SqlCommand ExecuteReader SqlDataReader SqlDataReader SqlDataReader SqlDataReader SQL Server SqlDataReader SqlDataReader SqlDataReader HasRows true false FieldCount Read true false Close SqlDataReader SqlDataReader 1 SqlCommand SqlCommand cmd = new SqlCommand(sqlStr, conn); 2 SqlCommand ExecuteReader SqlDataReader conn.open(); SqlDataReader dr = cmd.executereader();

6 W.MeI/Xf 7HeN1f @5f 3LeJ5f V/KeO.Yf W.Yh J(Yg W.Yg 75g @5f W.MeI/Xf W.Yh J(Yg W.Yg 75g 7HeN1f 3LeJ5f V/KeO.Yf @5f W.MI/Xf 75g 7HeN1f J(Yg W.Yh 3)KO.Yf W.YeI')Xf 7HeV'1f 3LfJ5f V/KeO.Yf J5g J5h J5g W-Xe W&(YV46Kh V+Ye (Y (Yf J5g '6KO.Yg J5f W.Yf SqlDataReader Read true false dr.read(); 4 dr[0].tostring() 0 dr["groupname"].tostring() object 5 Close SqlDataReader SqlDataReader Close SqlDataReader dr.close(); SqlCommand SqlDataReader private void btnlogin_click(object sender, EventArgs e) if (txtusername.text.trim() == "" txtuserpassword.text.trim() == "") MessageBox.Show(" txtusername.focus(); return; string connstring Source=.\sqlexpress;Initial Catalog=AddressList;Integrated Security=True"; string sqlstr = string.format("select * from [User] where UserName='0' and Password='1'", txtusername.text.trim(), txtuserpassword.text.trim()); using (SqlConnection conn = new SqlConnection(connString)) SqlCommand cmd = new SqlCommand(sqlStr, conn); conn.open(); SqlDataReader sdr = cmd.executereader(); if (sdr.read()) MessageBox.Show(" else MessageBox.Show(",!", " txtusername.text = ""; txtuserpassword.text = ""; txtusername.focus(); sdr.close(); SqlCommand ExecuteReader SqlDataReader SqlDataReader Read Read true Read false

7 W.MeI/Xf 7HeN1f @5f 3LeJ5f V/KeO.Yf W.Yh J(Yg W.Yg 75g @5f W.MeI/Xf W.Yh J(Yg W.Yg 75g 7HeN1f 3LeJ5f V/KeO.Yf @5f W.MI/Xf 75g 7HeN1f J(Yg W.Yh 3)KO.Yf W.YeI')Xf 7HeV'1f 3LfJ5f V/KeO.Yf J5g J5h J5g W-Xe W&(YV46Kh W&g V+Ye (Y (Yf SQL using (SqlConnection conn = new SqlConnection(connString)) F9 Visual Studio SQL sqlstr SQL SQL SQL Server SQL F Visual Studio

8 W.MeI/Xf 7HeN1f @5f 3LeJ5f V/KeO.Yf W.Yh J(Yg W.Yg 75g @5f W.MeI/Xf W.Yh J(Yg W.Yg 75g 7HeN1f 3LeJ5f V/KeO.Yf @5f W.MI/Xf 75g 7HeN1f J(Yg W.Yh 3)KO.Yf W.YeI')Xf 7HeV'1f 3LfJ5f V/KeO.Yf J5g J5h J5g W-Xe W&(YV46Kh V+Ye J(Mh 7Yhe (Y (Yf '6KO.Yg J5f W.Yf Visual Studio 2008 App.config <xml version="1.0" encoding="utf-8" > <configuration> </configuration> App.config XML <xml version="1.0" encoding="utf-8" > <configuration> <connectionstrings> <add name="connectionstring" connectionstring="data Source=.\sqlexpress;Initial Catalog=AddressList;Integrated Security=True" providername="system.data.sqlclient" /> </connectionstrings> </configuration> ConnectionString NET 1 Visual Studio 2008 System. Configuration

9 W.MeI/Xf 7HeN1f @5f 3LeJ5f V/KeO.Yf W.Yh J(Yg W.Yg 75g @5f W.MeI/Xf W.Yh J(Yg W.Yg 75g 7HeN1f 3LeJ5f V/KeO.Yf @5f W.MI/Xf 75g 7HeN1f J(Yg W.Yh 3)KO.Yf W.YeI')Xf 7HeV'1f 3LfJ5f V/KeO.Yf J5g J5h J5g W-Xe W&(YV46Kh V+Ye W&(Yh W2(Mg W&(Yh (Y (Yf using System.Configuration; 3 ConfigurationManager ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString; ConnectionString DBHelper DBHelper class DBHelper public static string connstring = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString; string connstring = DBHelper.connString; SqlConnection SqlCommand SqlDataReader 1. 2.